Firefox will not open after computer crashed

My system crashed (I think due to recent extreme hot weather) so I turned everything off and left it overnight. On rebooting in the morning IE and email worked fine, as do all other programs, but Firefox would not open. I reinstalled it but still nothing, just a quick flash of the cursor. I tried uninstalling it and downloading the latest version but still have the same problem. What can I do?

It is possible that your security software (firewall, anti-virus) blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

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Maybe you restored to a version of Firefox that crashes or still have a virus problem.
(irrc some Firefox versions specifically had problems after Windows restores)
Follow up checking for malware and then try re-installing Firefox. I would also suggest you make a copy of your [[profiles|profile]] including all folders and sub files and put it somewhere safe as it may assist in restoring your bookmarks and information.
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* a typical post about malware checks:<br/>[/questions/914980#answer-302372]

Firefox will not open after installation. i have tried to install several times with the same results. installation sends a list to firefox each time. need help. willard lee

will not open after installation. i have tried to install several times with the same results. installation sends a list to firefox each time. need help. willard lee

Can you attach a screenshot or link to the instructions you are following?
You are on the 3.6 release and Firefox 7.0.1 is out. You can download and install the latest release from http://www.mozilla.org/en-US/firefox/new/ if you would like to update now. The 3.6 version will be maintained for a while longer, but you should update when you can.

Firefox will not open after attempting to upgrade to v5, sys restore didn't help

Was running 3.6 with no problems, but trying to upgrade today apparently broke it. The upgrade failed for some reason (the old .exe is still the only one in the Firefox folder & I can't find any files newer than April 2010 in there), but no matter how I try to run it, nothing happens - Firefox will not open, period. I tried reverting to last week with sys restore, scanning for malware with Malwarebytes, but still nothing happens. I'm using WinXP 5.1 media edition SP2 (yes, it's been around a few years but it works for me). I'm now using Chrome which seems to run just fine, tho I miss all my plugins.

Hi lwhealon
try from Start > Run > and type to check 1 of :
firefox -safe-mode
"C:\Program Files\Mozilla Firefox\firefox.exe" -safe-mode '''or'''
"C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -safe-mode
(to enable the Run box in win 7 see: [http://blogs.msdn.com/b/tims/archive/2006/09/18/windows-vista-secret-3-bringing-back-start-run.aspx enable Run box win 7] )
also check if [http://kb.mozillazine.org/Firewalls Firewall] or/and other security software blocking firefox start (like ad-blocker, web-accelerator etc).
[http://kb.mozillazine.org/Kill_application With Firefox completely closed] (probably because you can not start it), open the [http://kb.mozillazine.org/Installation_directory application folder] (by default, C:\Program Files\Mozilla Firefox on Windows) rename firefox.exe to firefox1.exe, then double-click firefox1.exe. If Firefox runs without problems, it could indicate that your firewall is blocking Firefox.
good luck

Firefox will not open after logging off. Will only work if I reboot computer.

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Use the [[profiles|Profile Manager]] to create a new profile. If the problem goes away, you can then [[Recovering important data from an old profile|move]] your bookmarks and other important settings into the new profile.

Firefox will not open after I've had viruses on my computer

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Use the [[profiles|Profile Manager]] to create a new profile. If the problem goes away, you can then [[Recovering important data from an old profile|move]] your bookmarks and other important settings into the new profile.

Firefox will not open after i use it 3 or 4 times i have to update to make it work ?

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Which security software (firewall, anti-virus) do you have?
Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.
A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

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I have reinstalled Firefox so it will run in order to perform the steps requested below.

Try this
*https://support.mozilla.org/en-US/kb/firefox-wont-start-find-solutions
Open TaskManager, if it running '''firefox.exe''' > end all processes
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* [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner]
* [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
* [http://www.surfright.nl/en/hitmanpro/ Hitman Pro]
* [http://www.eset.com/us/online-scanner/ ESET Online Scanner]
[http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.
Did this fix your problems? Please report back to us!

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AdapterDeviceID: 68a1
AdapterVendorID: 1002
Add-ons: [email protected]:0.79,{dc572301-7619-498c-a57d-39143191b318}:0.3.8.5,{BBDA0591-3099-440a-AA10-41764D9DB4DB}:2.0,{B7082FAA-CB62-4872-9106-E42DD88EDE45}:3.3.1,{972ce4c6-7e08-4474-a285-3208198ce6fd}:4.0
AvailableVirtualMemory: 4080922624
BuildID: 20110318052756
CrashTime: 1301350093
EMCheckCompatibility: true
FramePoisonBase: 00000000f0de0000
FramePoisonSize: 65536
InstallTime: 1301336545
Notes: AdapterVendorID: 1002, AdapterDeviceID: 68a1, AdapterDriverVersion: 8.713.3.3000
D3D10 Layers? D3D10 Layers-
ProductName: Firefox
ReleaseChannel: release
SecondsSinceLastCrash: 395
StartupTime: 1301350092
SystemMemoryUsePercentage: 27
Theme: classic/1.0
Throttleable: 1
TotalVirtualMemory: 4294836224
Vendor: Mozilla
Version: 4.0
Winsock_LSP: MSAFD Tcpip [TCP/IP] : 2 : 1 : %SystemRoot%\system32\mswsock.dll
MSAFD Tcpip [UDP/IP] : 2 : 2 :
MSAFD Tcpip [RAW/IP] : 2 : 3 : %SystemRoot%\system32\mswsock.dll
MSAFD Tcpip [TCP/IPv6] : 2 : 1 :
MSAFD Tcpip [UDP/IPv6] : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD Tcpip [RAW/IPv6] : 2 : 3 :
RSVP TCPv6 Service Provider : 2 : 1 : %SystemRoot%\system32\mswsock.dll
RSVP TCP Service Provider : 2 : 1 :
RSVP UDPv6 Service Provider : 2 : 2 : %SystemRoot%\system32\mswsock.dll
RSVP UDP Service Provider : 2 : 2 :
This report also contains technical information about

This was one of my first results on Google searching for this problem, so I thought I should give it a reply now that I can reply from Firefox.
I'm really not sure what fixed it. One of the pages I read when I was reading about mswsock.dll suggested any issues with it might be caused by spyware or a virus. This seemed likely since I'm running a fresh install of Windows 7 64-bit and had yet to protect it. I downloaded and installed Microsoft Security Essentials, and when I restarted my computer to finalize the install of MSE, Windows updated. When I got back into Windows I immediately started a scan, but the second thing I did was try to open Firefox, which actually opened. So three possible fixes:
-Merely installing Microsoft Security Essentials. Least likely to have fixed it.
-Updating Windows. More likely to have fixed it, but still doubtful.
-Restarting my computer. Most likely to have fixed it. It seems to me that rebooting hasn't been a magic fix since I ran Windows 98, so I often forget to try it, but honestly most of the time that's all a computer needs is to be turned off and on.
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It is possible that your security software (firewall, anti-virus) blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

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Have you tried this?
How to Enter iPhone Recovery Mode
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XULRunner
Error: Platform version ‘1.9.2.13’ is not compatible with
minVersion >= 1.9.2.14
maxVersion <= 1.9.2.14
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[Gecko]
MinVersion=1.9.2.15
Change to 1.9.2.13
Save. Start Firefox. Dirty? Yes. Works? Yes.
(Gecko is the forerunner or XULrunner)

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If there are problems with importing the IE Favorites in Firefox then export the favorites in IE to an HTML file and import that file in the Firefox Bookmarks Manager.
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Firefox will not open after computer crashed

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